•NERC has issued a Level 3 alert after large AI data centres disconnected from the grid during transmission faults
•Data centre response to grid faults now shapes reliability planning and coordination
The fact
The North American Electric Reliability Corporation (NERC) has issued a Level 3 Essential Actions alert after several large AI data centres disconnected from the grid during transmission faults. In one incident, around 1,800MW of electricity demand dropped within seconds when uninterruptible power supply (UPS) systems switched affected facilities to backup power.
NERC, which oversees the reliability of North America's bulk power system, said the incidents highlighted gaps in how large data centres are planned and managed within the electricity network. It called for improved modelling, coordination and operating practices as AI infrastructure continues to expand.
The assessment
The alert signals that large AI data centres now shape grid stability, not just consume power. How these facilities disconnect from and reconnect to the grid during faults is becoming as critical as total demand in system planning. Grid operators can no longer treat data centres as predictable loads — their behaviour during disturbances directly affects reliability.
For BTW readers, grid integration now ranks alongside power supply as a planning constraint for AI infrastructure. How data centres behave during disturbances will matter as much as how much electricity they draw.
What to watch
How utilities and transmission operators act on NERC's recommendations. Responses from hyperscale operators and any updates to reliability standards will show whether data centres become formal participants in grid planning.